Fabrication and Characterization of Transparent Super-long Titania Nanotube Arrays/FTO Electrode

Titanium film was deposited on fluorine-doped tin oxide-coated glass substrate(FTO) by electron beam evaporation(EBEAM),ultra-long titania nanotube arrays/FTO electrode was fabricated by potentiostatic anodization of the titanium film in C2H6O2+NH4F electrolyte at room temperature.The structure and the composition of the titania nanotube arrays/FTO electrode were characterized by field emission scanning electron microscope(FESEM),transmission electron microscope(TEM),X-ray photoelectron spectroscope(XPS),X-ray diffraction(XRD) and transmission spectrometer.The results show that inner diameter and length of the as-prepared titania nanotube are 43nm and 5.4μm respectively.The titania nanotube arrays/FTO transparent electrode after annealing in air is of anatase phase with length of 5μm.The transmittance of the titania nanotube arrays is 45% in visible wavelength range and an absorbance peak is observed at wavelength of 400nm.